Consolidated Statements of Operations (USD $) In Thousands, except Per Share data, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Net sales	$ 126,526	$ 184,947	$ 138,336
Cost of sales	81,626	128,699	98,952
Gross profit	44,900	56,248	39,384
Operating expenses:
Research, development and engineering	22,328	26,189	27,791
Selling, general and administrative	36,786	44,720	44,902
Restructuring charges	5,070	1,889	(114)
Total operating expenses	64,184	72,798	72,579
Loss from operations	(19,284)	(16,550)	(33,195)
Interest income (expense), net	133	107	5
Other income (expense), net	316	163	108
Loss before income taxes	(18,835)	(16,280)	(33,082)
Provision for (benefit from) income taxes	484	1,670	321
Net loss	$ (19,319)	$ (17,950)	$ (33,403)
Net loss per share:
Basic and diluted (in usd per share)	$ (0.33)	$ (0.32)	$ (0.67)
Shares used in computing net loss per share:
Basic and Diluted (in shares)	58,538	55,299	50,073